Mismatch in Standard constant rolling torque equation with EDEM and Mfix

SROY

In Mfix DEM, Zhou’s model introduces a non-dimensional rolling torque to resist rotation when two particles are in contact by multiplying rolling friction coefficient with diameter.
But EDEM, rolling friction coefficient is multiplied with radius.

I didn't understand the difference in these two standard constant torque equations.
Does this mean to divide the rolling friction coefficient with 2 when using Mfix DEM?

Stephen Cole

Hi,

I'm not familiar with Mfix rolling friction model but you can see the details of the EDEM one here:

https://help.altair.com/edem/topics/creator_tree_physics/the_standard_rolling_friction_model_r.htm

Or if you did want to look at/modify the code it can be found here:

https://community.altair.com/discussion/36255/edem-api-contact-model-example-standard-rolling-friction-3-0

Regards

Stephen